CN214013104U

CN214013104U - Battery insulation film

Info

Publication number: CN214013104U
Application number: CN202023224006.7U
Authority: CN
Inventors: 张健; 王胜会
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-08-20
Anticipated expiration: 2030-12-28

Abstract

The utility model relates to a battery insulation film is equipped with on this battery insulation film and carries out the at least one crease of buckling with the battery insulation film, still is equipped with the liquid-permeable district of arranging with the crease interval, and has the nick that sets up along battery insulation film thickness direction penetrating in the liquid-permeable district. The battery insulating film of the utility model can allow the battery insulating film to be bent when being wrapped by arranging at least one crease for bending the battery insulating film, thereby improving the wrapping effect; in addition, the nicks which are arranged through the thickness direction of the battery insulating film are arranged, so that the electrolyte can flow on two sides of the battery insulating film, and the wetting effect of the battery core can be improved.

Description

Battery insulation film

Technical Field

The utility model relates to a power battery spare part technical field, in particular to battery insulating film.

Background

Lithium ion batteries are used as an efficient energy storage device, and are applied to micro robots, Bluetooth headsets, electric vehicles, energy storage power stations and the like. Although lithium ion batteries have many advantages, safety accidents caused by the lithium ion batteries also occur occasionally. Among them, many causes of safety accidents of lithium ion batteries occur, for example, collision, high temperature, external short circuit, overcharge, overdischarge, internal short circuit and the like can cause thermal runaway inside the battery, thereby causing safety accidents of the lithium ion batteries.

Therefore, in order to improve the safety performance of the lithium ion battery, an insulating film is generally wrapped on the outer side of the electrode assembly to solve the problem of short circuit between the case and the electrode assembly. However, due to structural limitations, the conventional insulating film generally can only be coated in a whole large area, which provides good insulation, but also increases the difficulty of wetting the cell.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a battery insulating film, which can allow the insulating film to be bent during wrapping and reduce the infiltration difficulty of the battery cell.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a battery insulating film, be equipped with on the battery insulating film and supply the battery insulating film carries out at least one crease of buckling, still be equipped with the liquid-permeable district that the crease interval was arranged, just have in the liquid-permeable district and follow the nick that battery insulating film thickness direction set up thoroughly.

Further, the fold is provided through or semi-through in the thickness direction of the battery insulating film.

Further, the fold is in a dotted line shape formed by a plurality of first straight lines arranged in sequence, or the fold is in a dotted line shape formed by a plurality of first straight lines arranged alternately and a first dot structure.

Further, the length of a single first straight line segment is between 2 and 30 mm.

Further, the notch is in a dotted line shape formed by a plurality of second straight line segments arranged in sequence, or the notch is in a dot-and-dash line shape formed by a plurality of second straight line segments and second dot-shaped structures arranged alternately.

Further, the length of the single second straight line segment is between 1 and 15 mm.

Further, the scores are multiple channels arranged side by side in the liquid permeable area, or the scores are net-shaped arranged in the liquid permeable area in an interweaving manner.

Further, each of the scores is arranged obliquely with respect to the fold.

Further, the angle of inclination of each score relative to the fold is between 30-150 °.

Further, the distance between the liquid permeable area and the adjacent crease is not less than 5 mm.

Compared with the prior art, the utility model discloses following advantage has:

the battery insulating film of the utility model can allow the battery insulating film to be bent when being wrapped by arranging at least one crease for bending the battery insulating film, thereby improving the wrapping effect; in addition, the nicks which are arranged through the thickness direction of the battery insulating film are arranged, so that the electrolyte can flow on two sides of the battery insulating film, and the wetting effect of the battery core can be improved.

In addition, the crease is arranged through or semi-through along the thickness direction of the battery insulating film, so that the bending of the battery insulating film can be facilitated. The crease is in a dotted line shape or a dotted line shape, which is further beneficial to bending of the battery insulating film in the wrapping process. The score is in a dotted line shape or a dotted line shape, and the fluidity of the electrolyte between both sides of the battery insulating film can be improved. The notches are designed into a plurality of channels which are arranged in the liquid permeable area side by side or are designed into a net shape which is arranged in an interlaced mode, so that a larger flow area can be provided for electrolyte, and the infiltration effect of the battery core can be improved.

Further, providing the scores to be arranged obliquely with respect to the fold line can prevent the fold line from affecting when the battery insulating film is bent. By setting the inclination angle of the score with respect to the fold to be between 30 ° and 150 °, the effect of the score on the bending of the battery insulating film can be further reduced. And the distance between the liquid permeable area and the adjacent crease is set to be not less than 5mm, so that the liquid permeable area can be prevented from influencing the bending of the battery insulating film.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a battery insulating film according to an embodiment of the present invention;

FIG. 2 is another schematic structural diagram of a battery insulating film according to an embodiment of the present invention;

description of reference numerals:

1. folding; 2. and (4) scoring.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a battery insulating film, which is provided with at least one crease for bending the battery insulating film, and a liquid permeable area arranged at a distance from the crease, wherein the inside of the liquid permeable area is provided with a score which is arranged through along the thickness direction of the battery insulating film.

Specifically, as a specific embodiment of the battery insulating film of the present embodiment, as shown in fig. 1 and 2, the battery insulating film is specifically provided with four folds 1 arranged at intervals so that it can be applied to a rectangular-shaped cell. And the distance L between the two folds 1 positioned at the upper and lower ends and the edge of the battery insulating film is smaller than the distance H between the two folds 1 positioned in the middle. With the adoption of the arrangement, when the battery insulating film is wrapped on the battery core, the influence on the battery core soaking effect due to the lap joint between the upper end and the lower end of the battery core insulating film can be reduced.

Here, it should be noted that when the battery insulating film is applied to the cylindrical cell, the number of creases 1 can be reduced accordingly. In addition, based on the difference of electricity core shape, still can set up horizontal and vertical arrangement's crease 1 simultaneously to can set up the breach that penetrating set up correspondingly on the battery insulating film, so that wrap up the corner position of utmost point group.

In order to facilitate the bending of the battery insulating film to wrap the pole group, the fold 1 of the present embodiment is provided through or semi-through in the thickness direction of the battery insulating film. The term "semi-permeable" is not limited to the case where the thickness of the fold 1 is half of the thickness of the battery insulating film, but is used to generally refer to various cases where the thickness of the fold 1 is smaller than the thickness of the battery insulating film. In addition, in order to achieve both the strength of the battery insulating film and the ease of bending, as shown in fig. 1, the fold 1 of the present embodiment is in the shape of a dotted line composed of a plurality of first straight line segments arranged in sequence.

Wherein the length L of a single first straight line segment₁Between 2-30mm and the width of the first straight line segment is typically no greater than 0.5mm based on the manufacturing process. The broken-line-shaped fold 1 of the present embodiment includes the case where the lengths of the first straight line segments are the same, and may also include the case where the lengths of the first straight line segments are not all the same. Note that, the fold of the present embodimentIn addition to the dotted line shown in fig. 1, 1 may be a dashed line formed by first straight line segments and first dot structures which are alternately arranged.

Still as shown in fig. 1, the liquid permeable regions of the present embodiment are two in an up-down interval arrangement, and the distance K between each liquid permeable region and the adjacent fold 1 is not less than 5mm, so as to facilitate bending of the battery insulating film. As shown in fig. 1, the score 2 of the present embodiment is a plurality of tracks arranged side by side in each liquid permeable area to increase the area for the electrolyte to flow through. And in order to reduce the influence of the scores 2 on the bending of the battery insulating film, each score 2 of the present embodiment is arranged obliquely with respect to the fold 1. Further, the angle of inclination of each score 2 with respect to the fold 1 is between 30 ° and 150 °.

In this embodiment, to improve the wetting effect of the battery cell, the inclination directions of the scores 2 in the two liquid permeable areas are opposite to the inclination directions of the creases 1. Of course, the inclination directions of the scores 2 in the two liquid-permeable areas can also be inclined towards the same side instead of being opposite. Still referring to fig. 1, the score 2 of the present embodiment is a dotted line formed by a plurality of second straight segments arranged in sequence, and can be manufactured by hobbing or punching. In addition, the length L of the single second straight line segment₂Between 1 and 15mm and the width of the second straight segment is generally no greater than 0.5mm based on the fabrication process. In order to facilitate the bending of the battery insulating film, L is preferably adopted when the specific design is implemented₂<L₁。

In addition, it should be noted that the score 2 of the present embodiment may be a dot-and-dash line formed by a plurality of second linear segments and second dot structures alternately arranged, in addition to the dashed line. Of course, the entire score 2 may have a linear structure, and may have other forms such as a broken line, a curve, and a dot matrix.

It should be noted that, in addition to the plurality of side-by-side scores 2 shown in fig. 1, the scores 2 in each liquid-permeable area may also be a plurality of scores as shown in fig. 2, that is, the scores 2 may be a net shape interwoven in the liquid-permeable area. Besides the same structure of the scores 2 of each liquid permeable area, the scores 2 of each liquid permeable area can also adopt different structures.

The battery insulating film of the embodiment can allow the battery insulating film to be bent during wrapping by arranging the plurality of folds 1, so that the wrapping effect can be improved; in addition, by providing the above-described notch 2 penetrating in the thickness direction of the battery insulating film, the electrolyte can be made to flow on both sides of the battery insulating film, and the wetting effect of the cell can be improved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery insulating film characterized in that: be equipped with on the battery insulating film and supply battery insulating film carries out at least one crease (1) of buckling, still be equipped with the liquid permeability district that crease (1) interval was arranged, just have in the liquid permeability district and follow battery insulating film thickness direction is through scoring (2) that set up.

2. The battery insulating film according to claim 1, wherein: the fold (1) is provided through or semi-through in the thickness direction of the battery insulating film.

3. The battery insulating film according to claim 2, wherein: the folding line (1) is in a dotted line shape formed by a plurality of first straight line segments which are sequentially arranged, or the folding line (1) is in a dotted line shape formed by a plurality of first straight line segments which are alternately arranged and a first dot structure.

4. The battery insulating film according to claim 3, wherein: the length of a single said first straight line segment is between 2-30 mm.

5. The battery insulating film according to claim 1, wherein: the nick (2) is in a dotted line shape formed by a plurality of second straight line segments which are sequentially arranged, or the nick (2) is in a dot-and-dash line shape formed by a plurality of second straight line segments which are alternately arranged and second dot structures.

6. The battery insulating film according to claim 5, wherein: the length of the single second straight line segment is between 1 and 15 mm.

7. The battery insulating film according to claim 5, wherein: the nicks (2) are multiple channels arranged in the liquid permeable area side by side, or the nicks (2) are net-shaped arranged in the liquid permeable area in an interweaving mode.

8. The battery insulating film according to claim 7, wherein: each score (2) is arranged obliquely with respect to the fold (1).

9. The battery insulating film according to claim 8, wherein: the angle of inclination of each score (2) relative to the fold (1) is between 30 ° and 150 °.

10. The battery insulating film according to any one of claims 1 to 9, wherein: the distance between the liquid permeable area and the adjacent crease (1) is not less than 5 mm.